Put the verbs in brackets in the past simple tense or past perfect tense
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1. Neil Armstrong and Buzz Aldrin (collect) __________ some moon dust samples before they (return) __________ to Earth.
2. By the time Yang Liwei (become) __________ the first person sent into space by the Chinese space program in 2003, NASA (already, send) __________ over 100 people.
3. After the spaceship Soyuz 37 (be) __________ in orbit around the earth, Pham Tuan and Viktor Gorbatko (conduct) __________ some experiments.
4. When we (arrive) __________ in Kennedy Space Center, the space shuttle (already, launch) __________ into space.
5. Dennis Tito already (complete) __________ 900 hours of training by the time he (fly) __________ into space 2001.
1. Neil Armstrong and Buzz Aldrin (collect) __________ some moon dust samples before they (return) __________ to Earth.
2. By the time Yang Liwei (become) __________ the first person sent into space by the Chinese space program in 2003, NASA (already, send) __________ over 100 people.
3. After the spaceship Soyuz 37 (be) __________ in orbit around the earth, Pham Tuan and Viktor Gorbatko (conduct) __________ some experiments.
4. When we (arrive) __________ in Kennedy Space Center, the space shuttle (already, launch) __________ into space.
5. Dennis Tito already (complete) __________ 900 hours of training by the time he (fly) __________ into space 2001.